Yellow diffusion-fast color formers of the benzimidazole class



Patented Apr. 3, 1951 t UNITED STATES PATENT OFFICE YELLOW DIFFUSION-FAST COLOR FORM- ERS OF THE BENZEMIDAZOLE CLASS Winfred 0. Craig, Westfield, N. J., assignor to General Aniline & Film Corporation, New York, N. Y., a corporation of Delaware No Drawing. Original application November 9, 1948, Serial No. 59,203. Divided and this application February 11, 1950, Serial No. 143,833

4 Claims. (Cl. 269-309) The present invention relates to non-dififusing R2 color forming components of the Z-phenyl benzimidazole class, having improved solubility characteristics and capable of yielding upon color- C R (Rl)n forming development yellow dyestuff images of R3 enhanced spectral characteristics and exceedingly N fine gram wherein R is a phenyl radical, a carbon atom of In the present day practical application of which is directly linked to the carbon atom of the color photography, the method most generally heterocyclic ring, 1. e., phenyl; halogen phenyl,

used involves the employment of a monopack i. e" v0mm.ophenyl bromophenyl and the like;

having differently sensitized superimposed silver alkyl phenyl, i. e" toluyl, ethylphenyl and the halide emulsion layers t p tt y like; alkoxyphenyl, i. e., methoxyphenyl, ethoxystuff component last to diffusion in the emulsion phenyl and the like, R1 is the r a di 0 a1 and which upon development of the exposed NH CO CH2 A monopack with a primary aromatic amino developer yields subtractively colored dyestuff images, i. e., cyan, magenta and yellow I The yellow component generally employed is an open chain keto methylene compound such as acetoacetanilide, benzoylacetoacetanilide, and

R2 is an alkyl chain containing at least 10 carbon atoms, i. e., decyl, undecyl, dodecyl, myristyl, tetradecyl, pentadecyl, octadecyl and the like; R3 is a water solubilizing group such as sulfo, carboxy and the like, A is an alkyloyl radical, i. e., the like. For most purposes the dye images proacetyl, propionyl, butyryl, d the like 0Y1, duced by such components are satisfactory albenzoyl, naphthoyl and the like cyan) @511" though they leave something to be desired so far bethoxyl n15 1 or as spectral characteristics and grain are con- Examples of compounds embraced by the above cerned. Another disadvantage in the utilization formula are the following 1 of such components is their low solubility, and (l) 2-(4 -benzoy1acetam i nophenyl) 1 octaparticularly their low solution stability. decylbenzimidazole-5-sulfonic acid.

I have now found that the disadvantages which 181137 manifest themselves in the utilization of the gen- .erally employed yellow color formers can be over- N come with the production of dyestuff images of OONHCQOHLCQO enhanced spectral characteristics and fine grain H038 by employing for the formation of the yellow image in the color forming development method (2) 2 (4' benzoylacetaminophenyl) 1 a 2"-phenyl benzimidazole containing a Water ben imid z le s lfoni acid.

solubilizing group in the fused-on benzene ring, (3) 2 (4I benzoylacetaminophenyl) 1 myris a radical imparting fastness to difiusion on the 'tylbenzimidazole 5 Si11fonic acid I nitrogen atom in the 1-position of the hetero- (4) 4 benzoylacetaminophenyl) 1 mcyclic ring, and an acetamido radical in the decylbenzimidazole-il-sulfonic acid.

phenyl ring attached to the carbon atom in 2- 4 0181131 position. These color formers yield very desirat bleazomethine dye images by color forming dev I velopment with developers of the p-phenylene- NHCQCHZ'IOOQ diamine type, and in addition have very improved o s solubility characteristics when compared to the N keto methylene compounds generally employed in the color development process.

These Compounds as is evident from their octadecylbenzimidazole--5-sulfomc acid. structure have general utility as intermediates in I the manufacture of azo dyes. Such compounds I T -"O and their preparation constitute the purposes and objects of my invention. 0-

HOaS- N/ I The compounds contemplated herein may be depicted by the following structural formula: 'Q

(5) 2-[(3.5 dibenzoylacetamino)phenyl] l (6) 2 [(3 benzoylacetamino 4' chloro)- phenyl] 1 octadecylbenzimidazole 5- sulfonic acid.

lSH37 (7) 2 [(3' benzoylacetami'no 4' methoxy) phenyll 1 octadecylbenz'imidaz'ole '5- sulfonic acid.

mHu

\N trnooomcoQ (10) 2 (4' acetoacetaminophenyl') l octadecylbenzimidazole-5-carboxylic acid.

(11) 2 (4 carbethoxyacetaminophenyl)-1- octadecylbenzimidazole-5-sulfonic acid.

(12) 2-(4'-cyanoacetarriinophenyl)-1-octadecylbenzimidazole-5-sulfonic acid.

C isHrn HOaS The compounds are prepared by heating a 2- (4'-aminophenyl) -1-1ong chain alkyl benzimidazole-5-sulfonic or carboxylic acid with an acyl acetic ester while mixing or by heating the aforesaid components in the presence of pyridine to a temperature of about 100-130C.

The parent benzimidazole, on the other hand, is prepared by heating a 3-amino-4-long alkyl chain aminobenzene 's'u'lfonic or carboxylic acid with the desired nitro benzene carboxylic acid chloride in the presence of pyridine or any other suitable acid binding agent, the nitro compound then being reduced to the corresponding amine. Preparation of the intermediate is analogous to the method described in my copending application Ser. No. 745,113, filed April 30., 1947, now U. S. Patent 2,530,349, "with the exception that the l-hydroxy-2-naphthoyl chloride is replaced by the desired nitro benzoyl chloride, the resulting product then being reduced to the corresponding amine.

-zoylacetic ester, 'heated at 110-120" C. for 4 hours.

Emulsions designed for yielding the desired yellow image are prepared by dispersing a small quantity of the color former, i. e., about .5 gram of the color former in 100 cc. of a photographic silver halide emulsion, coating the emulsion on a support and drying the same. The film containing the emulsion may be processed by the negative-positive method or by the reversal method While utilizing for color development a primary aromatic amino developer such as pdiethylamino-aniline and the like.

The invention is further illustrated by the following examples, but it is to be understood that the invention is not restricted thereto.

Example 1 the product is collected on a filter, washed'with parts of methanol, sucked dry, then air dried.

.5 gram of the purified product is dispersed'in 100 cc. of a photographic silver bromide emulsion. The emulsion is coated on a transparent support and .dried. After exposure the film is developed in a color forming developer comprising an aqueous solution of 10 parts of sodium sulfite, 15 parts of p-diethylamino aniline, 2.5 partsfof sodium carbonate, and parts of potassium bromide. The silver and dye image is thus formed. After removal of the silver by bleaching in potassium ferrocyanide solution and subsequent fixing, a bright yellow dyestuff image of very line grain is obtained.

Example 2 30 parts of 2-(4-aminopheny1)-l-octadecylbenzimidazole-S-sulfonic acid, 15 parts of benand 200 parts of pyridine-are The reaction mixture is diluted with parts of water, and then drowned in a mixture of 200 parts of concentrated hydrochloric acid, and 1000 parts of ice-Water. The crude product is collected on a filter, washed twice with cold water, sucked dry as possible, and air dried.

The crude product is purified by taking up in 200 parts of methanol and heating at reflux (65 C.) for /2 hour. After cooling to 20-25-C., the product is collected on a filter, Washed with '75 parts of methanol, sucked dry, then air dried. The product is the same as that of Example 1 and may be used as there indicated.

Example 3 GIBHIW This product is prepared in the same manner as Example 1 from 30 parts of 2-(3-amino- 5 phenyl) 1 octadecylbenzimidazole 5 sulfonic acid, and 15 parts of benzoylacetic ester. An intense yellow dye image of very fine grain is obtained by dispersing the color former in a photographic silver bromide emulsion and processing the emulsion as in Example 1.

Example 4 /l T ITTH.CO.CH=.CO.C

N/ NHL 0.011213 o.-@

This product is prepared in the manner of Example 1 from 28 parts of 2-(3, '-diaminophenyl) 1 octadecylbenzimidazole 5 I sulfonic acid, and 25 parts of benzoylacetic ester.

Dye images similar to those obtained in Examples 1 and 3 resultwhen utilizing the above color former for the production of an azomethine dye image.

Example 5 o c1 Hois- N/ I NH.C 0.01120 o.-

This product is prepared in the same manner as Example 1 from 30 parts of 2-[(3'amino-4'- chloro) phenyl] 1 octadecylbenzimidazole 5 sulfonic acid, and 15 parts of benzoylacetic ester.

A bright yellow azomethine dye image is pro- Boss duced by utilizing the above color former as in Example 1. Such dye images are characterized particularly by the fineness of their grain.

Example 6 OOH.

N NH-CO.CH2.CO.-

This product is prepared in the manner of Example 1 from 32 parts of 2-[(3'-amino-4'- methoxy) phenyl] 1 octadecylbenzimidazole 5-sulfonic acid, and 18 parts of benzoylacetic ester.

A bright yellow azomethine dye image is produced by utilizing the above color former as in Example 1. particularly by the fineness of their grain.

Example 7 0 ia ar C NH.CO.CH..CO.CH.. Ho.s--

This product is prepared in a manner similar to Example 1 from 27 parts of 2-(4'-aminophenyl) 1 octadecylbenzimidazole 5 sulfonic acid, and 15 parts of acetoacetio ester.

A bright yellow azomethine dye image is produced by utilizing the above color former as in Such dye images are characterized Example 1. Such dye images are characterized particularly by the fineness of their grain.

Example 8 I 1a a7 C-O-NEC 0.011;.0 0.0mm V This product is prepared in a manner similar to Example 1 from 27 parts of 2-(4'-aminophenyl) 1 octadecylbenzimidazole 5 sulfonic acid, and 12 parts of diethyl malonate.

duced by utilizing the above color former as in Example 1. Such dye images are characterized particularly by the fineness of their grain.

Example 9 wHav C NH.CO.CH..CN HOaS- N/ I Q The present application is a division of my co-pending application Serial No. 59,203, filed November 9, 1948, now U. S. Patent 2,500,487.

Various modifications of the invention will occur to persons skilled in this art, and I therefore do not intend to be limited in the patent granted except as necessitated by the appended claims.

I claim: I

1. Compounds of the following formula:

, wherein R is a phenyl radical, R1 is the grouping NH.CO.CH2.A, R2 is an alkyl radical containing at least 10 carbon atoms, R3 is a water solubilizing group, n is selected from the class consisting of 1 and 2, and A is a member of the class consisting of alkyloyl, aroyl, cyano and carbethoxy.

2. The compound 2 -(4 benzoylacetamino phenyl) l-octadecyl benzimidazole 5 sulfonic acid.

3. The compound 2 (3 benzoylacetamino phenyll- 1 octadecyl benzimidazole 5 sulfonic acid.

4. The compound 2-[(3.5"-di-benzoylacetami no) phenyl] -1-octadecyl benzimidazole-5-sulfonic acid.

WJNFRED C. CRAIG.

No references cited.

A bright yellow azomethine dye image is pro-. 

1. COMPOUNDS OF THE FOLLOWING FORMULA: 